这种虫子（不是蟑螂）看到一只，说明你家里已有很多只了！

Group 1 - The article discusses the presence and characteristics of a small insect known as the moth midge, specifically the white-spotted midge, which thrives in urban sewer systems [3][4] - The white-spotted midge is a highly adaptable insect, with a life span of only a few days as an adult, primarily residing in dark, organic-rich environments such as sewers and sinks [4][5] - The midge's larvae feed on organic waste, and they can complete a generation in less than a month, indicating a rapid reproduction rate [4][5] Group 2 - The white-spotted midge does not bite or suck blood, thus it does not directly transmit diseases, but it can carry bacteria like E. coli on its body due to its habitat [7][8] - To control the midge population, a mixture of salt and baking soda can be poured down drains, but this method is only a temporary solution due to the insect's strong reproductive capabilities [8] - An increase in the midge population may signal potential blockages in drainage systems, suggesting that regular maintenance of plumbing is necessary [10]